rhubarb-lip-sync/lib/webrtc-8d2248ff/webrtc/base/refcount.h

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2016-06-21 20:13:05 +00:00
/*
* Copyright 2011 The WebRTC Project Authors. All rights reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef WEBRTC_BASE_REFCOUNT_H_
#define WEBRTC_BASE_REFCOUNT_H_
#include <string.h>
#include <utility>
#include "webrtc/base/atomicops.h"
namespace rtc {
// Reference count interface.
class RefCountInterface {
public:
virtual int AddRef() const = 0;
virtual int Release() const = 0;
protected:
virtual ~RefCountInterface() {}
};
template <class T>
class RefCountedObject : public T {
public:
RefCountedObject() {}
template <typename P>
explicit RefCountedObject(const P& p) : T(p) {}
template <typename P>
explicit RefCountedObject(P&& p) : T(std::move(p)) {}
template <typename P1, typename P2>
RefCountedObject(P1 p1, P2 p2) : T(p1, p2) {}
template <typename P1, typename P2, typename P3>
RefCountedObject(P1 p1, P2 p2, P3 p3) : T(p1, p2, p3) {}
template <typename P1, typename P2, typename P3, typename P4>
RefCountedObject(P1 p1, P2 p2, P3 p3, P4 p4) : T(p1, p2, p3, p4) {}
template <typename P1, typename P2, typename P3, typename P4, typename P5>
RefCountedObject(P1 p1, P2 p2, P3 p3, P4 p4, P5 p5) : T(p1, p2, p3, p4, p5) {}
template <typename P1,
typename P2,
typename P3,
typename P4,
typename P5,
typename P6>
RefCountedObject(P1 p1, P2 p2, P3 p3, P4 p4, P5 p5, P6 p6)
: T(p1, p2, p3, p4, p5, p6) {}
template <typename P1,
typename P2,
typename P3,
typename P4,
typename P5,
typename P6,
typename P7>
RefCountedObject(P1 p1, P2 p2, P3 p3, P4 p4, P5 p5, P6 p6, P7 p7)
: T(p1, p2, p3, p4, p5, p6, p7) {}
template <typename P1,
typename P2,
typename P3,
typename P4,
typename P5,
typename P6,
typename P7,
typename P8>
RefCountedObject(P1 p1, P2 p2, P3 p3, P4 p4, P5 p5, P6 p6, P7 p7, P8 p8)
: T(p1, p2, p3, p4, p5, p6, p7, p8) {}
template <typename P1,
typename P2,
typename P3,
typename P4,
typename P5,
typename P6,
typename P7,
typename P8,
typename P9>
RefCountedObject(P1 p1,
P2 p2,
P3 p3,
P4 p4,
P5 p5,
P6 p6,
P7 p7,
P8 p8,
P9 p9)
: T(p1, p2, p3, p4, p5, p6, p7, p8, p9) {}
template <typename P1,
typename P2,
typename P3,
typename P4,
typename P5,
typename P6,
typename P7,
typename P8,
typename P9,
typename P10>
RefCountedObject(P1 p1,
P2 p2,
P3 p3,
P4 p4,
P5 p5,
P6 p6,
P7 p7,
P8 p8,
P9 p9,
P10 p10)
: T(p1, p2, p3, p4, p5, p6, p7, p8, p9, p10) {}
template <typename P1,
typename P2,
typename P3,
typename P4,
typename P5,
typename P6,
typename P7,
typename P8,
typename P9,
typename P10,
typename P11>
RefCountedObject(P1 p1,
P2 p2,
P3 p3,
P4 p4,
P5 p5,
P6 p6,
P7 p7,
P8 p8,
P9 p9,
P10 p10,
P11 p11)
: T(p1, p2, p3, p4, p5, p6, p7, p8, p9, p10, p11) {}
virtual int AddRef() const { return AtomicOps::Increment(&ref_count_); }
virtual int Release() const {
int count = AtomicOps::Decrement(&ref_count_);
if (!count) {
delete this;
}
return count;
}
// Return whether the reference count is one. If the reference count is used
// in the conventional way, a reference count of 1 implies that the current
// thread owns the reference and no other thread shares it. This call
// performs the test for a reference count of one, and performs the memory
// barrier needed for the owning thread to act on the object, knowing that it
// has exclusive access to the object.
virtual bool HasOneRef() const {
return AtomicOps::AcquireLoad(&ref_count_) == 1;
}
protected:
virtual ~RefCountedObject() {}
mutable volatile int ref_count_ = 0;
};
} // namespace rtc
#endif // WEBRTC_BASE_REFCOUNT_H_